Over the past few weeks I’ve been helping A-Level student, and fellow Witney resident, Jesse Lawrence with a BSA Crest Award project. He opted to go for something with a local twist and has decided to map the quality of the dark skies around Witney. Now he’s embarked on the last phase of his project: crowdsourcing a dark sky map by recruiting volunteers (that’s you!).

It would be fantastic if you could add your own observations to the project. All you have to do is count the stars an fill in this form. For now, you need to be located in the Northern Hemisphere.

Although this began as a local project, the system is up and running and will work at scale so please fill in the form from anywhere – not just Witney.

You have to go out on a clear night and then report your location (your postcode or lat/long) along with the faintest star you can see in the Plough (or saucepan, or big dipper, in Ursa Major). You just need to use Jesse’s map on the online form at http://bit.ly/DarkSkyMap. Find the faintest star that you can see from those marked with letters on the form. That helps identify the limit of brightness for your location. Repeats over several nights will help average a better result, as will multiple people observing from the same spot over time.

The results appear on a live-updated map, which you can see at http://cdb.io/1rdVb4O. The more people that join in, the better the final map will be.

I'm Robert Simpson and I work at Google in London. I am the creator of <a href="http://dotastronomy.com">.Astronomy</a>. I am astrophysicist formerly of the <a href="http://zooniverse.org">Zooniverse</a> at the University of Oxford.